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<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>选择器</title>
<link  rel="stylesheet" href="Demo02.css"/>
</head>
<body>
	<a href="http://www.baidu.com"  target="_blank" >百度一下</a>
    <a href="Demo01.html" target="_blank"  id="aa">Demo01</a>
</body>
</html>
